Sissy, Yes it's a 650. The re-sizer tube came as an accessory and at the very top of the deprimer station there is about a sixteenth of an inch of threads that it screws onto. When I tried to resize some Gun Clubs it just squashed them. Bill

1/16th of inch of threads isn't very much at all. I don't think it would be able to size and hold onto the machine with that little of thread coupling. I would bet money that would fail in less than a few hundred rounds sized if you do get it to work. Just Say'n................

I had a MEC with the same "resizer die" around the deprimer pin. Could never get a proper resizing on the hulls and it really slowed down the whole process.
Finally gave up and bought a MEC "Hull Conditioner" that resized and deprimed together. It did a good job but added an additional, separate step.

As a general rule, if I choose to load much with a MEC, I don't mess with the ring-type resizer for a little list of reasons. If you are just getting started with reloading, you would be better off to omit it or, painful as it may be, take the necessary cash to get yourself into a collet type resizer.

As per recoil sissy buy that Mec super sizer, it's # 77 I think it's a collet type and yes it's a separate step but if you shoot different guns-- one with a tight chamber or not perfectly round this will be your salvation, it will also do an excellent job on steel head gun clubs which are about the longest lasting hull for me. Ross

No knock toward the Gun Clubs, they are great hulls, maybe the best as far as the promotional style goes. But those steel bases don't retain a size memory like brass bases and some times can be a bitch to resize especially with a slip over resizer vs. a collet type resizer.

Resizing on a 650 is a separate function, before you actually reload. You have to have the 1/4 inch bushing that goes in the deprime station that comes with your reloader, unless you threw it away because it wasn't obvious what it was for, to raise the shell up enough for the resizer to slide all the way to the rim. Works fine if set up correctly. Bert

Bill: I have a Hornady 366. This has a resizer; but I find it a PIA to resize on this loader. I have a MEC Supersizer. This has a collett resizer and I can resize a box of shells in one minute. I would highly recommend that you use the Supersizer and resize all of your hulls and then load them on your 650. It will give you piece of mind that your reloads will fit in any gun that you choose to shoot them in. JMHO. Ed